单项选择题

The energy gained from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.

A．conduct
B．proceed
C．progress
D．practice
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The old buildings blend with the new ones in perfect ______ , so a walk along Huai Hai Road is an enjoyable discovery.
A．harmony
B．order
C．control
D．action
单项选择题
We'd rather you ______ the account tomorrow.
A．settled
B．settle
C．would settle
D．will settle
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